Investigation of the Compressive Strength, Ultrasonic Pulse Velocity, Calorimetric, Microstructural and Rheological Properties of the Calcined Laterite-Based Geopolymer Materials

Hseumou, Eva Lunine; Moudio, Aimard Manfred Njawa; Tchakouté, Hervé Kouamo; Rüscher, Claus Henning

doi:10.1007/s10904-023-02869-5

Cited by 4 publications

(1 citation statement)

References 55 publications

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“…%). [4][5][6][7] The presence of iron oxide in the aluminosilicate materials used in the synthesis of geopolymer materials can have either a negative or positive effect on the properties of these materials, depending on the oxidation state of the iron present in the raw material. 8 The structure of geopolymer materials with high iron oxide content cannot be investigated using the 29 Si and 27 Al NMR techniques.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Compressive Strength of Geopolymer Materials Based on Metakaolin with Hematite and Magnetite Gels as Additives

Dimace Lionel Vofo Ngnintedem,

Jean Mermoz Siéwé,

Hervé Kouamo Tchakouté

et al. 2024

SCE

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The purpose of this work is to increase the compressive strength and improve the microstructure of geopolymer materials by adding hematite and magnetite gels, as well as their powders, cured at 80 °C. Hematite and magnetite are dissolved in 10 M sodium hydroxide. Dried gels of hematite and magnetite were then ground to produce powders of dissolved hematite and magnetite. For the production of various geopolymer materials, the metakaolin was replaced by 0 and 10 wt. % of each additive and then mixed with the hardener containing the SiO2/Na2O molar ratio set at 1.6. The results show that the reference geopolymer has a compressive strength of 51.11 MPa. These values are 50.99 and 47.59 MPa for the geopolymer materials with 10 wt. % of dissolved magnetite gel and the powder of dissolved magnetite cured at 80 °C, respectively. They are 59.52 and 63.23 MPa for those prepared using 10 wt. % of dissolved hematite gel and for the powder of dissolved hematite cured at 80 °C, respectively. Si, Al, Fe, Na and Ti form a homogeneous phase in the geopolymer structures with the exception of a few magnetite particles agglomerated in the geopolymer materials. Compressive strength was found to be improved by the use of hematite gel and dissolved hematite powder cured at 80 °C as additives. A slight reduction in the compressive strength was observed when the dissolved magnetite gel and the powder of the dissolved magnetite cured at 80 °C were used as additives.

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